20559659 has 2 divisors, whose sum is σ = 20559660. Its totient is φ = 20559658.

The previous prime is 20559641. The next prime is 20559673. The reversal of 20559659 is 95695502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20559659 - 2²⁰ = 19511083 is a prime.

It is not a weakly prime, because it can be changed into another prime (20550659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279829 + 10279830.

It is an arithmetic number, because the mean of its divisors is an integer number (10279830).

Almost surely, 2^20559659 is an apocalyptic number.

20559659 is a deficient number, since it is larger than the sum of its proper divisors (1).

20559659 is an equidigital number, since it uses as much as digits as its factorization.

20559659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 20559659 is about 4534.2760171829. The cubic root of 20559659 is about 273.9504190395.

The spelling of 20559659 in words is "twenty million, five hundred fifty-nine thousand, six hundred fifty-nine".